US20230388901A1 - Communication device, base station, control method, and computer-readable storage medium - Google Patents

Communication device, base station, control method, and computer-readable storage medium Download PDF

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Publication number
US20230388901A1
US20230388901A1 US18/234,125 US202318234125A US2023388901A1 US 20230388901 A1 US20230388901 A1 US 20230388901A1 US 202318234125 A US202318234125 A US 202318234125A US 2023388901 A1 US2023388901 A1 US 2023388901A1
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United States
Prior art keywords
communication
communication method
base station
condition
information regarding
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US18/234,125
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English (en)
Inventor
Naoko Imai
Yusuke OI
Masahiro Takahata
Tsubasa Shibauchi
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Assigned to HONDA MOTOR CO., LTD reassignment HONDA MOTOR CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OI, YUSUKE, IMAI, NAOKO, Shibauchi, Tsubasa, TAKAHATA, MASAHIRO
Publication of US20230388901A1 publication Critical patent/US20230388901A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user

Definitions

  • the present invention relates to a communication device, a base station, a control method, and a computer-readable storage medium, and particularly relates to a technique for selecting a communication partner.
  • V2X communication by which a vehicle communicates wirelessly with another vehicle or an object, enables the vehicle to acquire various types of information or to provide information to others.
  • a vehicle transmits data to a device such as a server on the Internet or a network constructed by a service provider
  • the vehicle has to connect to a predetermined communication device connectable to such a network, for example, a base station or the like of a cellular communication network.
  • a predetermined communication device connectable to such a network, for example, a base station or the like of a cellular communication network.
  • wireless resources and arithmetic resources such as frequency and time related to communication of the predetermined communication device are insufficient, and it may not be possible to perform the communication with sufficient quality.
  • the vehicle is capable of connecting to another device by using a communication method different from that of the predetermined communication device, and transmitting and receiving data through such another device.
  • a vehicle connects to a specific device (in one example, a device such as an access point of a wireless LAN) other than a base station of a cellular communication network by using a different communication method
  • a specific device in one example, a device such as an access point of a wireless LAN
  • a base station of a cellular communication network by using a different communication method
  • an area where it is possible to connect to such a specific device may be extremely limited, unlike the cellular communication network covering a geographically wide area.
  • Japanese Patent Laid-Open No. 2017-184051 describes a configuration for connecting between vehicles to transfer data to a predetermined node.
  • a vehicle close to the predetermined node is identified by communication between the vehicles, and data is transferred to the vehicle close to the predetermined node.
  • a communication device When a communication device establishes a connection with another device in order to communicate with a predetermined device, it is supposed that the communication device is incapable of recognizing whether such another device is connectable to the predetermined device.
  • the vehicle close in distance to a predetermined node is not always capable of communicating with the predetermined node.
  • the distance to the predetermined node is apart to an extent that it is impossible to ensure wireless quality sufficiently or a case where the vehicle is in communication and is incapable of relaying the communication.
  • connection target vehicle is close to the predetermined node
  • the communication device connects to another device, such another device is incapable of connecting to the predetermined device, and the communication device may have to change the connection target of another device.
  • relay transmission is not performed, for example, in a case where an area or the like where the communication in a communication method used by the communication device is not permitted is defined, it is not possible to establish a connection with a partner device in an aspect in which the communication device cannot recognize, in some cases. Such cases may degrade convenience of communication.
  • the present invention provides a technique for improving convenience of communication.
  • a communication device is a communication device that performs communication wirelessly, the communication device being configured to: receive by using a first communication method, from a first another device, information regarding a condition for communication in a second communication method within a geographical range where communication with the first another device is possible, the second communication method being different from the first communication method; and select a second another device that performs the communication in the second communication method, based on the information regarding the condition.
  • FIG. 1 is a diagram illustrating a system configuration example.
  • FIG. 2 is a diagram illustrating a hardware configuration example of a base station and a communication device.
  • FIG. 3 is a diagram illustrating a functional configuration example of the base station.
  • FIG. 4 is a diagram illustrating a functional configuration example of the communication device.
  • FIG. 5 is a diagram illustrating an example of a flow of processing performed in the system.
  • FIG. 1 illustrates a configuration example of a system in the present embodiment.
  • the present system is a wireless communication system in which vehicles 111 to 114 , which are capable of performing wireless communication, connect to a predetermined network such as the Internet, and perform communication.
  • the vehicles 111 to 114 according to the present embodiment connect to a base station 101 of a cellular communication system, for example, and perform communication with a predetermined communication device.
  • the vehicles 111 to 114 are, for example, configured to be capable of communicating with each other by connecting to each other in a communication method different from the cellular communication method for communicating with the base station 101 .
  • the communication method different from the cellular communication method is, for example, any communication method of cellular Vehicle-to-Everything (V2X), wireless LAN, Dedicated Short Range Communications (D SRC), and Bluetooth (registered trademark).
  • V2X Vehicle-to-Everything
  • D SRC Dedicated Short Range Communications
  • Bluetooth registered trademark
  • the vehicles 111 to 114 are configured to connect to a first device such as the base station 101 in a first communication method, and to be connectable with each other in a second communication method different from the first communication method.
  • a first device such as the base station 101 in a first communication method
  • a second communication method different from the first communication method.
  • the vehicles 111 to 114 are capable of performing, for example, not only vehicle-to-vehicle communication but also communication with another device such as, for example, an access point of a wireless LAN.
  • the vehicle 112 is present in a location where it is possible to communicate with another device 121 to be fixed in a communication method other than the cellular communication method.
  • the vehicle 113 and the vehicle 114 are also capable of connecting to and communicating with surrounding devices depending on their locations.
  • FIG. 1 illustrates an example in which the vehicle 112 is directly connectable to another device 121 , which is fixed, but there is no intention of being limited to this.
  • the vehicle 112 may be capable of communicating with such another device 121 , which is fixed, through a wireless communication device such as further another vehicle. The same applies to other vehicles.
  • the vehicles 111 to 114 are capable of transmitting, for example, information that has been acquired by sensors of the respective vehicles to a device such as a predetermined information processing server.
  • the information processing server is capable of performing various types of processing such as control for automated driving with this information.
  • the vehicles 111 to 114 are capable of acquiring various types of information such as driving control information and service information in accordance with the locations of the vehicles from a server that holds, for example, predetermined information.
  • the communication capacity that can be provided by the base station 101 may be insufficient.
  • the communication of the communication device for example, the vehicle 112
  • the communication method which is different from the cellular communication method
  • the device 121 so as to offload the communication.
  • communication of the vehicle 111 is offloaded to another device through the other vehicles 112 to 114 .
  • communication of the vehicle 113 and the vehicle 114 can be similarly offloaded through another vehicle or another device.
  • the vehicle 111 establishes a connection with a vehicle in the surroundings, and communicates with a predetermined device such as a server on the Internet through the connection.
  • the vehicle 111 transmits a connection request for requesting another vehicle in the surroundings to relay the communication, and establishes a connection.
  • the vehicle 111 can, for example, establish a connection with another vehicle having good wireless quality of communication with the vehicle 111 in the second communication method.
  • such another vehicle cannot communicate with the predetermined device that is a communication partner with sufficient quality.
  • the vehicle 111 attempts communication with the predetermined device through such another vehicle. After recognizing that the requested quality is not satisfied, the vehicle 111 disconnects from such another vehicle, and attempts a connection to any other vehicle. As a result, it is not possible for the vehicle 111 to communicate with the predetermined device in a timely manner.
  • the vehicle 111 will be harmed by connecting to such a vehicle. Furthermore, also focusing on the vehicle 112 , there may be a case where it is not possible to know before the connection whether the device 121 is a device capable of communicating with the predetermined device, whether it is a reliable device, or the like.
  • information regarding a condition for communication is acquired by use of the first communication method.
  • the vehicle 111 to the vehicle 114 acquire, from the base station 101 , the information regarding the condition for the communication in the second communication method such as a wireless LAN within a geographical range where communication with the base station 101 is enabled.
  • the base station 101 can notify, by a broadcast signal, a communication device in its coverage area of at least a part of the information regarding the condition for the communication in the second communication method within the coverage area of a cell formed by the self-device.
  • the base station 101 can notify, by an individual signal, a communication device in connection with the self-device of at least a part of the information regarding the condition for the communication in the second communication method within the coverage area of the cell formed by the self-device.
  • the base station 101 may transmit, by a broadcast signal, a part of the information to a communication device within the coverage area, and may notify, by an individual signal, a remaining part of the information to the communication device in connection.
  • the vehicle 111 to the vehicle 114 respectively select partner devices to communicate with in the second communication method, based on the condition for the communication.
  • the vehicle 111 can select a device that relays the communication of the self-device, based on the condition that has been acquired.
  • the vehicle 112 can determine whether to establish a connection with the device 121 , based on the condition that has been acquired.
  • the information regarding the condition includes, for example, a condition about a geographical range where communication in the second communication method is executable within a geographical range where the communication with the base station 101 is enabled.
  • the base station 101 identifies a location where a fixed device (for example, the device 121 ) that performs communication in the second communication method is present within a coverage area of a cell formed by the self-device, and notifies the vehicle 111 to the vehicle 114 of a predetermined range including the location as the geographical range where the communication in the second communication method is executable.
  • the base station 101 may collect results that the communication device has attempted the communication in the second communication method in the past within the coverage area of the self-device, and may notify the condition about the geographical range where the communication in the second communication is executable, based on statistics for whether it has been possible to communicate in the second communication method for every geographical area.
  • the base station 101 may notify the vehicle 111 to the vehicle 114 of information regarding the range where the use of the second communication method is prohibited.
  • the information regarding the condition may include, for example, information indicating at least any of a capacity and a communication amount per unit time to be achievable by a communication device present within a geographical range where the communication with the base station 101 is executable by the relay transmission using the second communication method.
  • the base station 101 can notify the communication device within the coverage area of the self-device of the information of the communication capacity and the communication amount per unit time to be achievable, when the vehicle 112 relays in the second communication method.
  • the base station 101 can notify the communication device within the coverage area of information of the communication device (for example, the vehicle 112 ) capable of performing the relay transmission to a device (for example, the device 121 ) connected with a predetermined network such as the Internet by use of the second communication method.
  • the base station 101 may notify the communication device within the coverage area of information indicating a device (for example, the vehicle 111 , the vehicle 113 , or the vehicle 114 ) incapable of performing the relay transmission to the device connected with the predetermined network by using the second communication method.
  • a device for example, the vehicle 111 , the vehicle 113 , or the vehicle 114
  • the vehicle 111 to the vehicle 114 are capable of determining whether it is possible to connect to the predetermined network through relaying, in a case where there is no device (for example, the device 121 ) that is directly connectable using the second communication method and is in connection with the predetermined network in the surroundings.
  • the base station 101 may notify the device (for example, the device 121 ) in direct connection with the predetermined network of at least any of the communication capacity and the communication amount per unit time to be achievable by the communication using the second communication method.
  • a device capable of communicating using the second communication method within the coverage area of the base station 101 and the communication capacity or the communication amount per unit time to be achievable by the device may be notified from the base station 101 to the communication device within the coverage area.
  • the communication device transmits a predetermined signal to such another device in the second communication method
  • the information regarding the condition may include, for example, information that associates a period from transmission of the predetermined signal to reception of a response to the predetermined signal by another device with communication to be executable when such another device relays the communication between the communication device and the predetermined device that is a communication partner.
  • the vehicle 111 transmits the predetermined signal, before the connection with another device such as the vehicle 112 to the vehicle 114 is established.
  • Such a predetermined signal is a signal for causing the vehicle 112 to the vehicle 114 to transmit a response signal to the vehicle 111 in response to reception of the predetermined signal, and in one example, can be a signal by the vehicle 111 for requesting a connection for relaying the communication with the predetermined device such as a specific server.
  • the vehicle 112 to the vehicle 114 control a transmission timing of a response signal to the predetermined signal, based on communication to be executable by the self-device with the predetermined device that is a communication partner of the vehicle 111 .
  • the transmission timing here is set to make the time from a reception timing of the predetermined signal shorter, as relay of the communication of the vehicle 111 can be executed on a better condition.
  • the information regarding the transmission timing is notified from the base station 101 to the communication device within the coverage area. That is, the base station 101 notifies the communication device within the coverage area of information that associates the time, from when a device that can perform the relay transmission receives the predetermined signal to when the device transmits a response, with the quality of the relay transmission.
  • the communication device within the coverage area of the base station 101 is capable of estimating the quality of a case where each of the other devices in the surroundings relays the communication of the self-device, based on a difference in time from when the self-device transmits the predetermined signal to when the self-device receives the response.
  • the time from when the device that can perform the relay transmission receives the predetermined signal to when the device transmits the response can be set shorter, as the device has a higher priority in relaying the communication.
  • the communication device within the coverage area of the base station 101 is capable of identifying another device having a higher priority, based on a difference in the time from when the self-device transmits the predetermined signal to when the self-device receives the response, and is capable of requesting for relaying to such another device.
  • a transmission timing of the response may be so set that the priority is higher, as the quality of the relay is better.
  • the information regarding the condition may include information that identifies a device permitted to communicate in the second communication method.
  • the base station 101 can identify a reliable device as the device permitted to communicate in the second communication method, and can notify a communication device within the coverage area of the self-device of information indicating the identified device. In this manner, by notifying the communication device within the coverage area of the information that identifies the device permitted to communicate in the second communication method, it is possible to reduce a concern that the communication of the communication device is wiretapped.
  • the base station 101 can set, to be a reliable device, an access point, which has been registered beforehand, of a wireless LAN used in a cooperative operation between a cellular communication system such as a long term evolution (LTE)-wireless LAN (WLAN) aggregation (LWA) and a wireless LAN.
  • the base station 101 may set a device in connection with such a reliable access point to be the reliable device.
  • the base station 101 may identify a communication device that has been connected with, for example, a cellular network and that has been authenticated beforehand, as a reliable device. According to this, the communication device within the coverage area of the base station 101 becomes capable of selecting and connecting to a device with high reliability.
  • the information regarding the condition may include, for example, information that identifies the device prohibited from communicating in the second communication method. That is, notification in a white list scheme for notifying the information that identifies the device permitted to communicate in the second communication method as described above may be given, or notification in a black list scheme for notifying the information that identifies the device prohibited from communicating in the second communication method may be given. In one example, a device that has failed in authentication, a device that has not been authenticated, or the like can be identified as the device prohibited from communicating in the second communication method.
  • the information regarding the condition may include information indicating a frequency that should be used in the communication in the second communication method.
  • the base station 101 may notify the communication device within the coverage area of the information indicating the frequency that should be used when searching for a communication device in the second communication method, as the information regarding the condition. For example, in a case where a restriction is imposed such that only some frequency channels are available from among a plurality of frequency channels supported in the second communication method, information indicating such a restriction may be notified from the base station 101 to the communication device within the coverage area. In addition, in a case where many communication devices that are in communication in some frequency channels are present and a few communication devices that are in communication in the other frequency channels are present, it may be notified that the frequency channels used by such a few communication devices should be used.
  • FIG. 2 illustrates a hardware configuration example of the base station 101 and the vehicle 111 to the vehicle 114 according to the present embodiment.
  • the base station 101 and the vehicle 111 to the vehicle 114 each include a general-purpose computer in one example, and the computer includes, for example, a CPU 201 , a memory 202 , a storage device 203 , a communication circuit 204 , and an input and output circuit 205 .
  • FIG. 2 illustrates a configuration example of hardware according to the present embodiment, and illustrations of the other configurations such as a configuration of the base station 101 as a general base station and configurations of the vehicle 111 to the vehicle 114 as vehicles are omitted.
  • the CPU 201 executes, for example, a program stored in the memory 202 to perform processing to be described later and conduct control of the entire device. Note that the CPU 201 can be substituted by any one or more processors such as an IVIPU and an ASIC.
  • the memory 202 holds a program for causing the base station 101 and the vehicle 111 to the vehicle 114 to perform various types of processing, and also functions as a work memory when the program is executed.
  • the memory 202 is a random access memory (RAM) or a read-only memory (ROM).
  • the storage device 203 is, for example, a detachable external storage device, a built-in hard disk drive, or the like, and holds various types of information.
  • the communication circuit 204 performs signal processing related to communication, acquires various types of information from an external device through a communication network, and transmits the various types of information to the external device.
  • the information that has been acquired by the communication circuit 204 can be stored in, for example, the memory 202 or the storage device 203 .
  • the base station 101 and the vehicle 111 to the vehicle 114 each can include a plurality of communication circuits 204 .
  • the input and output circuit 205 controls, for example, outputs of screen information to be displayed on a display device, not illustrated, audio information to be output from a speaker, and receiving of user inputs via a keyboard, a pointing device, or the like.
  • the input and output circuit 205 may control a device that integrally inputs into and outputs from a touch panel or the like.
  • the configuration of FIG. 2 is one example, and for example, the base station 101 and the vehicle 111 to the vehicle 114 each may have dedicated hardware for performing the above-described processing.
  • FIG. 3 illustrates a functional configuration example of the base station 101 according to the present embodiment.
  • the base station 101 includes, for example, a condition identification unit 301 and a condition information notification unit 302 , as its functions. Note that these functional units may be implemented, for example, by the CPU 201 executing a program stored in the memory 202 or the storage device 203 , or may be implemented by dedicated hardware.
  • the condition identification unit 301 identifies a condition when the communication device performs communication using the second communication method, which is different from the first communication method used by the base station 101 for communication with the communication device that is subordinate to the self-device.
  • this condition can include a condition regarding a geographical range where the communication using the second communication method is executable within the coverage area of the base station 101 , a communication capacity or a communication amount per unit time, a relationship between the feasibility or priority of the relay communication and a transmission timing of a response to a predetermined signal, a device permitted to communicate or prohibited from communicating using the second communication method, and a frequency band/frequency channel that should be used for communication or in searching.
  • the condition information notification unit 302 notifies the communication device within the coverage area of the base station 101 of the information regarding the condition that has been identified by the condition identification unit 301 .
  • the information regarding the condition may be simultaneously notified to a plurality of communication devices by a broadcast signal or a multicast signal, or may be individually notified to each communication device by a unicast signal. Note that since they have been described above, details are not repeated here.
  • FIG. 4 illustrates a functional configuration example of the vehicle 111 to the vehicle 114 in the present embodiment.
  • the vehicle 111 to the vehicle 114 each include, for example, a condition information acquisition unit 401 , a connection target selection unit 402 , and a connection establishment unit 403 , as its functions.
  • these functional units may be implemented, for example, by the CPU 201 executing a program stored in the memory 202 or the storage device 203 , or may be implemented by dedicated hardware.
  • the condition information acquisition unit 401 acquires information regarding a condition for performing communication using the second communication method that has been notified from the base station 101 using the first communication method.
  • the connection target selection unit 402 selects a connection target device (for example, a requested target for relay transmission), based on the information that has been acquired. By using the information regarding the condition, the connection target selection unit 402 selects a device suitable for the communication using the second communication method, as information of the connection target. Note that this selection can be made in accordance with various criteria depending on the implementation. That is, the selection can be made with reference to the information regarding the condition, but is not limited to such information.
  • the connection establishment unit 403 connects to the connection target device that has been selected by the connection target selection unit 402 . For example, the connection establishment unit 403 establishes a connection with another communication device that functions as a relay device in order to request the device to perform relay transmission.
  • the present processing is implemented by, for example, the CPU 201 executing a program stored in the memory 202 or the storage device 203 . Note that here, a description will be given with regard to a flow of processing when the vehicle 111 determines the connection target device and connects to the vehicle 112 , which is connectable to the device 121 to make a relay request in order to offload the communication of the vehicle 111 .
  • the base station 101 identifies a condition in a case where the communication device performs communication in the second communication method, which is different from the first communication method to be used when the self-device communicates with a communication device that is a subordinate device within the coverage area of the self-device (S 501 ).
  • the condition can be at least any of a geographical range where the communication using the second communication method is executable within the coverage area of the base station 101 , a communication capacity or a communication amount per unit time, a relationship between the feasibility or priority of the relay communication and a transmission timing of a response to a predetermined signal, a device permitted to communicate or prohibited from communicating using the second communication method, and a frequency band/frequency channel that should be used for communication or in searching.
  • the base station 101 notifies the communication devices (the vehicle 111 to the vehicle 114 ) within the coverage area of the self-device of the information regarding the condition that has been identified (S 502 ).
  • This notification can be simultaneously given to a plurality of communication devices by a broadcast signal or a multicast signal, but may be individually given to a communication device in connection by a unicast signal.
  • the base station 101 can select the communication device (the vehicle 111 ) present in a location where the communication in the second communication method is executable from the communication devices in communication, based on the condition identified in S 501 , and can determine to offload the communication of the communication device that has been selected.
  • the base station 101 can instruct the vehicle 111 to select a connection target in the second communication method and establish a connection. Note that the vehicle 111 may autonomously determine to offload the communication.
  • the vehicle 111 selects a connection target device for the communication using the second communication method, based on at least a part of the information regarding the condition for the communication using the second communication method that has been notified from the base station 101 (S 503 ).
  • the vehicle 111 has identified, for example, the vehicle 112 , which has been authenticated, which is reliable, and which enables relaying to the device 121 , based on the information that has been acquired, and has determined to connect to the vehicle 112 .
  • the vehicle 111 transmits, for example, a connection request to the vehicle 112 (S 504 ), performs connection processing (S 505 ), and performs communication with the vehicle 112 by using the second communication method.
  • the vehicle 112 can also establish a connection for the communication using the second communication method with the device 121 , which is reliable.
  • the communication method used in the communication between the vehicle 112 and the vehicle 111 and the communication method used in the communication between the vehicle 112 and the device 121 may be different from each other.
  • the communication device when a communication device (for example, the vehicle 111 to the vehicle 114 ) that is present as subordinate to the base station 101 performs the communication using the second communication method, the communication device is capable of recognizing the condition for the communication before establishing a connection. Accordingly, each communication device is capable of connecting to appropriate another device and offloading data using the second communication method.
  • this embodiment it is possible to recognize the condition for performing the communication in the second communication method within a communicable range of the first another device, without performing processing for establishing a connection. As a result, for example, it is possible to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing connection establishment processing in an area where the communication in the second communication method is not executable.
  • the communication device is capable of identifying beforehand the geographical range where the communication in the second communication method is executable. Therefore, after confirming that the self-device is present within such a geographical range, it becomes possible to select the connection target device in the second communication method.
  • the communication device before the communication device is connected with the second another device and the relay transmission is started, it is possible to identify whether the communication capacity or the communication amount per unit time requested by the self-device is achievable in relaying by the second another device. Accordingly, for example, it becomes possible for the communication device to select the second another device capable of achieving the communication capacity or the communication amount per unit time requested by the self-device, and to establish the connection.
  • the communication device it becomes possible for the communication device to recognize the degree of communication to be executable, when making a request to each of the second another devices to perform relay transmission, based on the reception timing of the response to the predetermined signal to be transmitted before the connection with one or more second another devices in the surroundings and the information that has been acquired.
  • the communication device selects the second another device in accordance with the degree of the communication to be executable in correspond to the reception timing of the response to the predetermined signal. Therefore, it becomes possible to select an appropriate relay device in accordance with the communication requested by the communication device.
  • the reception timing of the response to the predetermined signal becomes earlier, as the device has a higher priority at the time of relaying. Therefore, by receiving a response early from the device having a high priority, the communication device is capable of establishing the connection.
  • the communication device it becomes possible for the communication device to select a connection target device from devices permitted to communicate in the second communication method.
  • the communication device it becomes possible for the communication device to select a connection target device from reliable devices that have been authenticated beforehand. In other words, it is possible for the communication device to prevent from connecting to an unreliable device.
  • the communication device it becomes possible for the communication device to select a connection target device from other devices that have looked into a device to be prohibited from communicating in the second communication method.
  • the communication device is capable of identifying beforehand the frequency that should be used in the communication in the second communication method. Therefore, it is possible to prevent an attempt to communication or the like on the frequency that should not be used.
  • the communication device is capable of limiting the frequency that should be used when searching for a connection target device. Therefore, searching on a frequency that should not be used can be prevented, and unnecessary waste can be prevented for power saving or the like.
  • the information regarding the condition for the communication in the second communication method other than the cellular communication is notified by the cellular communication between the base station and the terminal.
  • the base station becomes capable of efficiently notifying the communication devices present in a wide range of the condition for the communication in the second communication method.
  • the information suitable for each communication device can be individually notified. For example, in accordance with the location where the communication device stays, it becomes possible to notify the condition for the communication in the second communication method with regard to the surroundings of the location.
  • the condition when the communication device performs the communication in a relatively short distance is notified beforehand. Therefore, the communication device becomes capable of efficiently establishing the connection and performing the communication by using the information notified beforehand, for example, in a case where a period while such communication can be executed is limited because it is moving.
  • the communication device becomes capable of efficiently establishing the connection and performing the communication by using the information notified beforehand, for example, in a case where a period while the communication with a specific partner device can be executed in the second communication method is limited because it is traveling.
  • the base station it is possible for the base station to cause the communication device that has not performed the connection establishment processing in the second communication method to recognize the condition for a case where the communication device performs the communication in the second communication method, which is different from the first communication method to be used between the self-device and a subordinate communication device within the communicable range (coverage area) of the self-device.
  • the communication device it is possible for the communication device to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing the connection establishment processing in an area where the communication in the second communication method is not executable.
  • the communication device that is subordinate to the base station is capable of identifying beforehand the geographical range where the communication in the second communication method is executable. Therefore, the communication device that is subordinate to the base station is capable of confirming the presence in such a geographical range, and then selecting the connection target device in the second communication method.
  • the communication device before the communication device that is subordinate to the base station is connected with the second another device and the relay transmission is started, it is possible to identify whether the communication capacity or the communication amount per unit time requested by the self-device is achievable in relaying by the second another device. Therefore, for example, the communication device becomes capable of selecting the second another device with which the communication capacity or the communication amount per unit time requested by the self-device is achievable, and establishing the connection.
  • the communication device that is subordinate to the base station to recognize the degree of communication to be executable, based on the reception timing of the response to the predetermined signal to be transmitted before the connection with one or more second another devices in the surroundings and the information that has been acquired, when making a request to each of the second another devices to perform relay transmission.
  • the reception timing of the response to the predetermined signal becomes earlier, as the device has a higher priority at the time of relaying. Therefore, by receiving a response early from the device having a high priority, the communication device is capable of establishing the connection.
  • the communication device that is subordinate to the base station it becomes possible for the communication device that is subordinate to the base station to select a connection target device from devices permitted to communicate in the second communication method.
  • the communication device that is subordinate to the base station it becomes possible for the communication device that is subordinate to the base station to select a connection target device from reliable devices that have been authenticated beforehand. In other words, it is possible for the communication device to prevent from connecting to an unreliable device.
  • the communication device that is subordinate to the base station it becomes possible for the communication device that is subordinate to the base station to select a connection target device from other devices that have looked into a device to be prohibited from communicating in the second communication method.
  • the communication device that is subordinate to the base station is capable of identifying beforehand the frequency that should be used in the communication in the second communication method. Therefore, it is possible to prevent an attempt to communicate or the like on the frequency that should not be used.
  • the communication device that is subordinate to the base station is capable of limiting the frequency that should be used when searching for a connection target device. Therefore, searching on a frequency that should not be used can be prevented, and unnecessary waste can be prevented for power saving or the like.
  • the information regarding the condition for the communication in the second communication method other than the cellular communication is notified by the cellular communication between the base station and the terminal.
  • the base station becomes capable of efficiently notifying the communication devices present in a wide range of the condition for the communication in the second communication method.
  • the information suitable for each communication device can be individually notified. For example, in accordance with the location where the communication device stays, it becomes possible to notify the condition for the communication in the second communication method with regard to the surroundings of the location.
  • the condition when the communication device that is subordinate to the base station performs the communication in a relatively short distance is notified beforehand. Therefore, the communication device that is subordinate to the base station becomes efficiently establishing the connection and performing the communication by using the information notified beforehand, and increasing the time for actual communication, in a case where a period while such communication is possible is limited because it is moving.
  • this embodiment it is possible to recognize the condition for performing the communication in the second communication method within a communicable range of the first another device, without performing processing for establishing a connection. As a result, for example, it is possible to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing connection establishment processing in an area where the communication in the second communication method is not executable.
  • the base station it is possible for the base station to cause the communication device that has not performed the connection establishment processing in the second communication method to recognize the condition for a case where the communication device performs the communication in the second communication method, which is different from the first communication method to be used between the self-device and a subordinate communication device within the communicable range (coverage area) of the self-device.
  • the communication device it is possible for the communication device to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing the connection establishment processing in an area where the communication in the second communication method is not executable.
  • this embodiment it is possible to recognize the condition for performing the communication in the second communication method within a communicable range of the first another device, without performing processing for establishing a connection. As a result, for example, it is possible to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing connection establishment processing in an area where the communication in the second communication method is not executable.
  • the base station it is possible for the base station to cause the communication device that has not performed the connection establishment processing in the second communication method to recognize the condition for a case where the communication device performs the communication in the second communication method, which is different from the first communication method to be used between the self-device and a subordinate communication device within the communicable range (coverage area) of the self-device.
  • the communication device it is possible for the communication device to suppress unnecessary signal transmission and reception and unnecessary power consumption caused by performing the connection establishment processing in an area where the communication in the second communication method is not executable.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)
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